package com.twotwoshop.gateway.user.filter;




import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {



    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否是登录
        if(request.getURI().getPath().contains("/login")|| request.getURI().getPath().contains("/code" )){
            //放行
            return chain.filter(exchange);
        }


        //3.获取token - 支持多种方式获取
        String token = null;

        // 从Header中获取Authorization
        String authorization = request.getHeaders().getFirst("Authorization");
        if (StringUtils.isNotBlank(authorization) && authorization.startsWith("Bearer ")) {
            token = authorization.substring(7);
        }

        //4.判断token是否存在
        if(StringUtils.isBlank(token)){
            log.warn("未携带token，请求未授权");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }


        //6.放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置  值越小  优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
